FR2643256A1 - Hip prosthesis with a self-locking shaft - Google Patents

Hip prosthesis with a self-locking shaft Download PDF

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Publication number
FR2643256A1
FR2643256A1 FR8902543A FR8902543A FR2643256A1 FR 2643256 A1 FR2643256 A1 FR 2643256A1 FR 8902543 A FR8902543 A FR 8902543A FR 8902543 A FR8902543 A FR 8902543A FR 2643256 A1 FR2643256 A1 FR 2643256A1
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France
Prior art keywords
rod
intended
cone
rail
spherical
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FR8902543A
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French (fr)
Inventor
Jean-Francois Prudhomme
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SOREM ORTHO
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SOREM ORTHO
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Priority to FR8902543A priority Critical patent/FR2643256A1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/305—Snap connection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/368—Geometrical features with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4619—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof for extraction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

Hip prosthesis with a self-locking shaft, comprising a femoral shaft 1, of small thickness, which widens gradually from its point to the collar 7 of the cone 6 which completes it at its upper end, this shaft being provided on each of its surfaces with a rail 10 forming a relief, the upper end 8 of the cone 6 being provided with microstriae; a spherical femoral head 2 intended to be impacted on the end of the cone 6 of the shaft 1; a semi-spherical shell 3 intended to receive the femoral head 8; a semi-spherical acetabulum 4 provided with a certain number of openings 14 distributed uniformly on its surface in such a way as to permit an optimum positioning of connection screws 5, the said acetabulum 4 having at the base of its inner face four strips 13 of approximately parallelepipedal shape intended to fit in a groove 12 formed at the base of the shell 3.

Description

La présente invention a pour objet une prothèse de hanche à tige autobloquante à longue durée de vie. The present invention relates to a hip prosthesis with a self-locking rod with a long lifespan.

Pour réaliser des prothèses de hanches, on utilise généralement des prothèses fémorales présentant soit une surface lisse, soit une surface inégale. Les prothèses fémorales à surface lisse sont fixées dans la cavité médullaire du fémur au moyen d'un ciment qui assure, lors de l'implantation, le comblement entre l'os et l'implant. Cependant, une prothèse de hanche cimentée comporte à terme un risque de descellement aseptique obligeant le plus souvent à une reprise chirurgicale qui ne va pas sans difficultés, notamment en ce qui concerne l'ablation du ciment. In order to produce hip prostheses, femoral prostheses are generally used which have either a smooth surface or an uneven surface. Femoral prostheses with a smooth surface are fixed in the medullary cavity of the femur by means of a cement which ensures, during implantation, filling between the bone and the implant. However, a cemented hip prosthesis eventually involves a risk of aseptic loosening, most often requiring a resumption of surgery which is not without difficulties, in particular as regards the removal of the cement.

Les prothèses fémorales à surface inégale, par exemple à couverture madréporique p#résentant un surfaçage micro- et macrobillé, permettent d'obvier aux inconvénients des prothèses à surface lisse en autorisant une fixation sans ciment, la couverture madréporique favorisant une ostéogénèse. Toutefois, ce type de prothèse fémorale présente l'inconvénient de ne pas permettre une stabilité immédiate, leur stabilisation n'étant effective qu'après une réhabitation osseuse et une ossification secondaire. En outre, en cas de reprise chirurgicale, la dépose, d'une telle prothèse est extrêmement difficile du fait de l'intégration intime du tissu osseux dans la surface madréporique, en particulier dans les macrobilles dont on risque un arrachement en même temps qu'une détérioration du tissu osseux. Femoral prostheses with uneven surface, for example with madreporic cover p # having a micro- and macrobead surfacing, make it possible to obviate the disadvantages of prostheses with smooth surface by allowing cementless fixation, the madreporic cover promoting osteogenesis. However, this type of femoral prosthesis has the disadvantage of not allowing immediate stability, their stabilization being effective only after bone rehabitation and secondary ossification. In addition, in the event of resumption of surgery, the removal of such a prosthesis is extremely difficult due to the intimate integration of the bone tissue in the madreporic surface, in particular in the macrobeads of which there is a risk of tearing at the same time as deterioration of bone tissue.

La présente invention a pour but de pallier ces inconvénients en proposant une prothèse de hanche à tige autobloquante et à longue durée de vie. The present invention aims to overcome these drawbacks by proposing a hip prosthesis with a self-locking rod and with a long service life.

La présente invention a ainsi pour objet une prothèse de hanche qui se caractérise essentiellement en ce qu'elle comporte en combinaison
a) une tige fémorale autobloquante en titane, de faible épaisseur, qui s'élargit progressivement de sa pointe à la collerette du cône qui la termine à son extrémité supérieure, cette tige étant munie sur chacune de ses faces d'un rail faisant relief, de section approximativement rectangulaire, et comportant à sa partie supérieure, entre le rail et la collerette, deux orifices disposés en regard l'un de l'autre, le cône de ladite tige étant muni de microstries pour la fixation de la tête.The present invention thus relates to a hip prosthesis which is essentially characterized in that it comprises in combination
a) a self-locking femoral stem made of titanium, of small thickness, which widens progressively from its tip to the flange of the cone which terminates it at its upper end, this stem being provided on each of its faces with a relief rail, of approximately rectangular section, and comprising at its upper part, between the rail and the flange, two orifices arranged opposite one another, the cone of said rod being provided with microstria for fixing the head.

b) deux cales en polyéthylène de haute densité de même épaisseur ou d'épaisseurs différentes destinées à être fixées latéralement sur la tige fémorale, au moyen de deux ergots positionnés à leur partie supérieure et destinés à se ficher dans les deux orifices de la tige, chacune de ces cales présentant sur celle de ses faces munie de l'ergot une rainure pour recevoir un rail de la tige fémorale, de manière à être bloquée en position par ledit rail, lesdites cales présentant une forme grossièrement cônique, s'évasant de leur extrémité inférieure jusqu'à la collerette et occupant approximativement le tiers supérieur de la tige
c) une tête fémorale sphérique en alliage chrome-cobalt destinée à être impactée sur le cône de la tige, les microstries du cône assurant la solidité de l'assemblage ;;
d) une coque semi-sphérique en polyéthylène de haute densité, destinée à recevoir la tête fémorale, ladite coque étant munie à sa base d'une collerette surmontée d'une rainure à sa face externe
e) un cotyle semi-sphérique en titane revêtu d'une couche d'hydroxyapatite et muni d'un certain nombre d'orifices répartis régulièrement à sa surface, de manière à permettre une mise en place optimale de vis de fixation en titane, ledit cotyle présentant à la base de sa face interne quatre lamelles de forme approximativement parallélépipédique destinées à venir se loger dans la rainure ménagée à la base de la coque.b) two shims of high density polyethylene of the same thickness or of different thicknesses intended to be fixed laterally on the femoral stem, by means of two lugs positioned at their upper part and intended to be inserted in the two orifices of the stem, each of these shims having on that of its faces provided with the lug a groove for receiving a rail of the femoral stem, so as to be locked in position by said rail, said shims having a roughly conical shape, widening from their lower end to the flange and occupying approximately the upper third of the stem
c) a spherical femoral head in chromium-cobalt alloy intended to be impacted on the cone of the rod, the microstria of the cone ensuring the solidity of the assembly;
d) a semi-spherical shell of high density polyethylene, intended to receive the femoral head, said shell being provided at its base with a collar surmounted by a groove on its external face
e) a semi-spherical titanium acetabulum coated with a layer of hydroxyapatite and provided with a number of orifices distributed regularly over its surface, so as to allow optimal placement of titanium fixing screws, said cup having at the base of its internal face four lamellas of approximately parallelepiped shape intended to be received in the groove formed at the base of the shell.

Le choix des matériaux mis en oeuvre pour réaliser les différentes pièces de la prothèse selon l'invention permet de répondre de façon optimale aux exigences attachées à ce type de produit. The choice of materials used to make the different parts of the prosthesis according to the invention makes it possible to optimally meet the requirements attached to this type of product.

En effet, le titane choisi pour la réalisation du cotyle, de la tige et des vis présente, outre une légèreté et des caractéristiques mécaniques avantageuses, une élasticité qui se rapproche le plus de celle de l'os. Indeed, the titanium chosen for the realization of the acetabulum, the rod and the screws has, in addition to lightness and advantageous mechanical characteristics, an elasticity which is closest to that of the bone.

Par ailleurs, l'alliage chrome-cobalt qui constitue la tête fémorale offre l'avantage de présenter une grande résistance à l'usure, ainsi qu'un excellent état de surface après polissage, en sorte que son assemblage avec la coque de polyéthylène constitue un ensemble présentant très Deu de forces de frottement, et donc une résistance accrue à l'usure. In addition, the chrome-cobalt alloy which constitutes the femoral head offers the advantage of having a high resistance to wear, as well as an excellent surface condition after polishing, so that its assembly with the polyethylene shell constitutes an assembly having very two friction forces, and therefore an increased resistance to wear.

Les cales de la prothèse selon l'invention peuvent être facultativement mises en place en nombre de deux ou d'une, leur présence n'étant pas nécessaire dans tous les cas. The spacers of the prosthesis according to the invention can optionally be placed in number of two or one, their presence not being necessary in all cases.

Elles ont pour fonction de remplir de façon optimum l'espace pouvant subsister entre la tige fémorale et le canal médullaire du fémur, à sa partie supérieure. Their function is to optimally fill the space that may remain between the femoral stem and the medullary canal of the femur, at its upper part.

La présente invention sera mieux comprise à la lecture de la description qui suit et qui se réfère au dessin annexé, étant bien entendu que cette description ne présente aucun caractère limitatif vis-à-vis de l'invention. The present invention will be better understood on reading the description which follows and which refers to the appended drawing, it being understood that this description has no limiting character with respect to the invention.

Dans le dessin annexé
- la figure 1 représente une vue latérale des différentes pièces constitutives de la prothèse selon l'invention.In the attached drawing
- Figure 1 shows a side view of the various constituent parts of the prosthesis according to the invention.

- la figure 2 représente une vue frontale de la tige fémorale de la prothèse représentée en figure 1. - Figure 2 shows a front view of the femoral stem of the prosthesis shown in Figure 1.

-- la figure 3 représente une vue frontale et une vue latérale d'une cale adaptable à la tige fémorale de la figure 1. - Figure 3 shows a front view and a side view of a wedge adaptable to the femoral stem of Figure 1.

Si on se réfère d'abord à la figure 1, on voit que la prothèse de hanche selon l'invention se compose d'une tige fémorale 1, d'une tête fémorale 2, d'une coque 3 et d'un cotyle 4 destiné à être maintenu par des vis 5. If we refer first to Figure 1, we see that the hip prosthesis according to the invention consists of a femoral stem 1, a femoral head 2, a shell 3 and a cup 4 intended to be held in place by screws 5.

La tige fémorale 1 comporte à sa partie supérieure un cne 6 dont la base forme une collerette 7 destinée à prendre appui sur le fémur, et dont l'extrémité supérieure 8 comporte des microstries. The femoral stem 1 has at its upper part a cone 6 whose base forms a flange 7 intended to bear on the femur, and whose upper end 8 comprises microstria.

Un aileron 9 anti-rotation disposé à la partie trochantérienne de la tige 1 est destiné à empêcher la rotation de la prothèse. Un rail 10 est disposé sur chaque face de la tige 1, permettant à sa partie inférieure un meilleur remplissage du canal médullaire, et à sa partie supérieure le maintien d'une cale 15 fixée par vissage dans un orifice 16 ménagé à la partie supérieure de la tige 1, laquelle comporte en outre un orifice 19 pour permettre son extraction au moyen d'un outil approprié.An anti-rotation fin 9 disposed at the trochanteric part of the rod 1 is intended to prevent rotation of the prosthesis. A rail 10 is disposed on each face of the rod 1, allowing at its lower part a better filling of the medullary canal, and at its upper part the maintenance of a wedge 15 fixed by screwing in an orifice 16 formed at the upper part of the rod 1, which further comprises an orifice 19 to allow its extraction by means of an appropriate tool.

La tête fémorale 2, après impaction sur le cne 6, est logée dans la coque hémisphérique 3, qui comporte à sa base une collerette 11 surmontée d'une rainure 12 à sa face externe, de manière à pouvoir être assemblée solidement au cotyle 4, grace à quatre lamelles 13, régulièrement espacées, disposées à sa faoe interne, et destinées à se loger dans la rainure 12. The femoral head 2, after impact on the cone 6, is housed in the hemispherical shell 3, which comprises at its base a flange 11 surmounted by a groove 12 on its external face, so as to be able to be assembled securely to the acetabulum 4, thanks to four regularly spaced strips 13, arranged at its internal face, and intended to be housed in the groove 12.

Le cotyle 4 ooorte en outre un certain nombre d'orifices 14 répartis régulièrenwt sur sa surface, de manière à perrtlettre le positionnenwt optimum des vis de fixation 5, dont le nombre peut varier de 3 à 6 selon les cas. The acetabulum 4 also carries a certain number of orifices 14 distributed regularly over its surface, so as to perretlettre the optimum position of the fixing screws 5, the number of which may vary from 3 to 6 depending on the case.

Si on se réfère ensuite à la figure 2, on retrouve sur la tige fémorale 1 les rails 10, l'aileron 9, la collerette 7 et le cône 6 terminé par les microstries 8. If we then refer to FIG. 2, we find on the femoral stem 1 the rails 10, the fin 9, the flange 7 and the cone 6 terminated by the microstria 8.

Si on se réfère enfin à la figure 3, on voit que la cale '15 présente une forme approximativement conique destinée à épouser pour partie la forme de la tige 1. Elle comporte en outre une rainure 17 pour recevoir le rail 10 de la tige 1, et un ergot 18 destiné à être logé dans l'orifice 16 de la tige 1. If we finally refer to Figure 3, we see that the wedge '15 has an approximately conical shape intended to partially match the shape of the rod 1. It further comprises a groove 17 for receiving the rail 10 of the rod 1 , and a lug 18 intended to be housed in the orifice 16 of the rod 1.

La prothèse selon l'invention se met en place après mise en oeuvre d'une râpe de même forme et de memes dimensions que celles de la tige, destinée à créer dans le fémur deux rainures de part et d'autre du canal médullaire. La tige préalablement assemblée à la coque est ensuite mise en place en force, après avoir été complétée si nécessaire par une ou deux cales permettant un remplissage optimum à la partie supérieure du fémur. Le cotyle préalablement fixé dans l'os de la hanche grâce aux vis est complété par la coque qui lui est solidarisée par les lamelles avant la mise en place de la tête fémorale à l'intérieur de cette dernière.  The prosthesis according to the invention is put in place after implementation of a rasp of the same shape and the same dimensions as those of the rod, intended to create in the femur two grooves on either side of the medullary canal. The rod previously assembled to the shell is then put into force, after having been supplemented if necessary by one or two wedges allowing optimum filling at the upper part of the femur. The cup previously fixed in the hip bone with the screws is completed by the shell which is joined to it by the lamellae before the placement of the femoral head inside the latter.

Claims (2)

REVENDICATIONS.CLAIMS. 1. Prothèse de hanche à tige autobloquante, caractérisée en ce qu'elle comporte en combinaison1. Hip prosthesis with self-locking rod, characterized in that it comprises in combination a) une tige fémorale < 1) n titane, de faible épaisseur, qui s'élargit progressivement de sa pointe à la collerette (7) du cône (6) qui la termine à son extrémité supérieure, cette tige étant munie sur chacune de ses faces d'un rail (10) faisant relief, de section approximativement rectangulaire, et comportant à sa partie supérieure, entre le rail (10) et la collerette (7) deux orifices (16) disposés en régard l'un de l'autre, l'extrémité supérieure (8) du cône (6) étant munie de microstries. a) a femoral rod <1) n titanium, of small thickness, which widens progressively from its point to the collar (7) of the cone (6) which terminates it at its upper end, this rod being provided on each of its faces of a raised rail (10), of approximately rectangular section, and comprising at its upper part, between the rail (10) and the flange (7) two orifices (16) arranged in relation to one another , the upper end (8) of the cone (6) being provided with microstria. b) une tête fémorale sphérique (2) en alliage chromecobalt destinée à être impactée sur l'extrémité du cône (6) de la tige (1) dont les microstries assurent la solidité de l'assemblage. b) a spherical femoral head (2) of chromecobalt alloy intended to be impacted on the end of the cone (6) of the rod (1) whose microstria ensure the solidity of the assembly. c) une coque (3) oemi-sphérique en polyéthylène de haute densité, destinée à recevoir la tête fémorale (8), ladite coque (3) étant munie à sa= base d'une collerette (11) surmontée d'une rainure (12) à sa face externe. c) a semi-spherical shell (3) of high density polyethylene, intended to receive the femoral head (8), said shell (3) being provided at its = base with a collar (11) surmounted by a groove ( 12) on its external face. d) un cotyle (4) semi-sphérique en titane revêtu d'une couche d'hydroxy-apatite et muni d'un certain nombre d'orifices (14) répartis régulièrement à sa surface, de manière à permettre une mise en-place optimale de vis (5) de fixation en titane, ledit cotyle (4) présentant à la base de sa face interne quatre lamelles (13) de forme approximativement parallélépipédique destinées à venir se loger dans la rainure (12) ménagée à la base de la coque (3). d) a semi-spherical titanium cup (4) coated with a layer of hydroxyapatite and provided with a number of orifices (14) distributed regularly on its surface, so as to allow it to be put in place optimal of titanium fixing screws (5), said acetabulum (4) having at the base of its internal face four lamellas (13) of approximately parallelepiped shape intended to be received in the groove (12) formed at the base of the shell (3). 2. Prothèse de hanche selon la revendication 1, caractérisée en ce que la tige (1) peut être complétée par au moins une cale (15) en polyéthylène de haute densité, fixée latéralement sur la tige (1) au moyen d'un ergot (18) positionné à sa partie supérieure et destiné à se ficher dans l'un des deux orifices (16) disposés à la partie supérieure de la tige (1), à chacune de ses faces, la cale (15) présentant sur celle de ses faces portant l'ergot (18) une rainure (17) pour recevoir le rail (10) de la tige (1), de manière à être bloquée en position par ledit rail (10), ladite cale (15) présentant une forme grossièrement conique, s'évasant à partir de son extrémité inférieure et occupant approximativement le tiers supérieur de la tige (1).  2. hip prosthesis according to claim 1, characterized in that the rod (1) can be completed by at least one wedge (15) of high density polyethylene, fixed laterally on the rod (1) by means of a lug (18) positioned at its upper part and intended to be inserted in one of the two orifices (16) arranged at the upper part of the rod (1), on each of its faces, the shim (15) having on that of its faces carrying the lug (18) a groove (17) for receiving the rail (10) of the rod (1), so as to be locked in position by said rail (10), said shim (15) having a shape roughly conical, flaring from its lower end and occupying approximately the upper third of the stem (1).
FR8902543A 1989-02-23 1989-02-23 Hip prosthesis with a self-locking shaft Withdrawn FR2643256A1 (en)

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FR8902543A FR2643256A1 (en) 1989-02-23 1989-02-23 Hip prosthesis with a self-locking shaft

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599426A1 (en) * 1992-11-23 1994-06-01 Bristol-Myers Squibb Company Set of prosthetic implants and method for converting a cementable implant to a press fit implant
FR2705883A1 (en) * 1993-06-04 1994-12-09 Revest Michel Prosthesis with ball bearing race for hip or other joint replacement
WO2005117763A3 (en) * 2004-05-28 2006-03-02 Smith & Nephew Inc Fluted intramedullary stem
US7892290B2 (en) 2004-05-28 2011-02-22 Smith & Nephew, Inc. Fluted sleeve hip prosthesis for modular stem

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Publication number Priority date Publication date Assignee Title
FR2289162A1 (en) * 1974-10-29 1976-05-28 Feldmuehle Anlagen Prod PERFECTED JOINT PROSTHESIS
FR2406433A1 (en) * 1977-10-21 1979-05-18 Oh Indong METHOD AND APPARATUS FOR IMPLANTING A COMPLETE JOINT PROSTHESIS IN THE HUMAN BODY
EP0032165B1 (en) * 1980-01-14 1983-12-28 GebràœDer Sulzer Aktiengesellschaft Blade-shaped shaft for anchoring a hip joint prosthesis
FR2575064A1 (en) * 1984-12-21 1986-06-27 Caltran Maurice Hip prosthesis
EP0196258A2 (en) * 1985-03-27 1986-10-01 Jean-Alain Epinette Cementless femoral component of a hip prosthesis

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Publication number Priority date Publication date Assignee Title
FR2289162A1 (en) * 1974-10-29 1976-05-28 Feldmuehle Anlagen Prod PERFECTED JOINT PROSTHESIS
FR2406433A1 (en) * 1977-10-21 1979-05-18 Oh Indong METHOD AND APPARATUS FOR IMPLANTING A COMPLETE JOINT PROSTHESIS IN THE HUMAN BODY
EP0032165B1 (en) * 1980-01-14 1983-12-28 GebràœDer Sulzer Aktiengesellschaft Blade-shaped shaft for anchoring a hip joint prosthesis
FR2575064A1 (en) * 1984-12-21 1986-06-27 Caltran Maurice Hip prosthesis
EP0196258A2 (en) * 1985-03-27 1986-10-01 Jean-Alain Epinette Cementless femoral component of a hip prosthesis

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599426A1 (en) * 1992-11-23 1994-06-01 Bristol-Myers Squibb Company Set of prosthetic implants and method for converting a cementable implant to a press fit implant
FR2705883A1 (en) * 1993-06-04 1994-12-09 Revest Michel Prosthesis with ball bearing race for hip or other joint replacement
WO2005117763A3 (en) * 2004-05-28 2006-03-02 Smith & Nephew Inc Fluted intramedullary stem
JP2008500884A (en) * 2004-05-28 2008-01-17 スミス アンド ネフュー インコーポレーテッド Grooved intramedullary stem
US7575603B2 (en) 2004-05-28 2009-08-18 Smith & Nephew, Inc. Fluted intramedullary stem
US7892290B2 (en) 2004-05-28 2011-02-22 Smith & Nephew, Inc. Fluted sleeve hip prosthesis for modular stem
AU2005249515B2 (en) * 2004-05-28 2011-11-10 Smith & Nephew, Inc. Fluted intramedullary stem
US8641773B2 (en) 2004-05-28 2014-02-04 Smith & Nephew, Inc. Fluted sleeve hip prosthesis for modular stem

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